12101857 has 2 divisors, whose sum is σ = 12101858. Its totient is φ = 12101856.

The previous prime is 12101839. The next prime is 12101863. The reversal of 12101857 is 75810121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9884736 + 2217121 = 3144^2 + 1489^2 .

It is an emirp because it is prime and its reverse (75810121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12101857 - 2¹¹ = 12099809 is a prime.

It is not a weakly prime, because it can be changed into another prime (12101357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6050928 + 6050929.

It is an arithmetic number, because the mean of its divisors is an integer number (6050929).

Almost surely, 2^12101857 is an apocalyptic number.

It is an amenable number.

12101857 is a deficient number, since it is larger than the sum of its proper divisors (1).

12101857 is an equidigital number, since it uses as much as digits as its factorization.

12101857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 12101857 is about 3478.7723409272. The cubic root of 12101857 is about 229.5887863442.

Adding to 12101857 its reverse (75810121), we get a palindrome (87911978).

The spelling of 12101857 in words is "twelve million, one hundred one thousand, eight hundred fifty-seven".